Poor Performance

FUEL

TROUBLESHOOTING

CAUSE

REMEDY

Poor Performance

(Air-Fuel Mixture Too Lean)

1. Main metering jet damaged; wrong size

1. Replace metering jet with a new one of

or type used

correct size and type.

2. Top shoulder seat of main discharge jet

2. Remove main discharge jet, clean, inspect

bad or tip damaged

and replace, if necessary.

3. Vacuum cylinder worn or stuck

3. Free cylinder if stuck. Replace if worn.

4. Power jet corroded or not seating

4. Clean power jet and channels. If seating is faulty,

replace the jet.

5. Low float level

5. Adjust float level.

6. Low fuel pump pressure

6. Refer to FUEL PUMP - Troubleshooting

Guide.

7. Air leak between carburetor base and

7. Tighten intake manifold-to-engine screws

engine intake ports

and carburetor mounting screws, Replace gaskets, if

necessary.

FUEL PUMP

Pump Leaks Fuel

1. Cover-to-body loose

1. Tighten. Check cover gasket. Replace gasket if faulty.

2. Ruptured body

2. Replace fuel pump.

3. Fuel line fittings loose

3. Tighten fittings as necessary to stop leakage. Replace

fittings, if necessary.

Insufficient Fuel Or Low Pump Pressure

1. Fuel line leaks

1. Tighten fittings or cover.

2. Ruptured pump body

2. Replace fuel pump.

3. Dirt under valves or valves not seating

3. Remove foreign particles from valves and seats. Install

new valve bodies.

B-53